Monohybrid Cross Practice

In cacti, long arms (A) are dominant to short arms (a). Suppose 2 heterozygous cacti are crossed. What percentage of their offspring are expected to have short arms?

• 0%

• 25%

• 75%

• 100%

Tags

NGSS.HS-LS3-3

If a homozygous dominant allele (AA) is crossed with a homozygous recessive allele (aa), all of the resulting offspring will be

• Homozygous dominant

• Heterozygous

• Homozygous Recessive

Tags

NGSS.HS-LS3-1

T - tall and t = short

In the punnett square below, what belongs in the missing square

• tt

• Tt

• Bb

• TT

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Dominant alleles are represented by a:

• Male gene

• lowercase letter

• recessive trait

• capital letter

What are the possible genotypes for this cross?

• TT=25% Tt=50% tt=25%

• All will be tall

• Tt=100%

• TT=75% tt=25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

How many alleles (letters) does a child get from each parent for each trait?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-LS3-1

In guinea pigs, the allele for short hair is dominant. If all the guinea pigs are born short haired what are the possible genotypes of the parents? (There are two possible combinations.)

• Ss + Ss

• SS + SS

• SS + Ss

• ss + ss

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Based on the completed Punnett square, what is the phenotypic Ratio?

• 1:2:1

• 3:2

• 3:1

• 1:3:1

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

Which of the following genotypes is homozygous dominant?

• A

• Aa

• AA

• aa

Tags

NGSS.HS-LS3-1

the physical characteristics that result from genes

• phenotype

• genotype

• heterozygous

• homozygous

Tags

NGSS.HS-LS3-1